A 75-Year-Old Man With Supine Hypotension.

Case presentation: A 75-year-old patient with autosomal dominant polycystic kidney disease (ADPKD) and hypertension was admitted to the hospital with abdominal pain secondary to a choledochal cyst resulting in biliary dilation. His hospital course was complicated by pneumonia, encephalopathy, and lower gastrointestinal bleeding (LGIB) that initially did not lead to hemodynamic compromise. To further evaluate the LGIB, a colonoscopy was performed, during which he experienced significant hypotension after being placed in the supine position and given anesthesia. The hypotension required treatment with vasoactive medications, termination of the colonoscopy, and transfer to the medical ICU for invasive hemodynamic monitoring and treatment.